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Large Caliber Main Guns

Battleships receive accuracy bonuses if the guns are fit and accuracy penalties if its overweight[1]. How much bonus/penalty a ship receives, depends on the battleship class, the caliber and type of the gun, and whether the battle takes place during day or night.

Ship Class IJN 35.6 cm35.6cm Twin Gun Mount
35.6cm Twin Gun Mount (Dazzle Camouflage)
Prototype 35.6cm Triple Gun Mount

KMS 38 cm38cm Twin Gun Mount
38cm Twin Gun Mount Kai

Sov 30.5 cm30.5cm Triple Gun Mount
30.5cm Triple Gun Mount Kai

RN 38.1 cm38.1cm Mk.I Twin Gun Mount
38.1cm Mk.I/N Twin Gun Mount Kai

Fr 38 cm38cm Quadruple Gun Mount
38cm Quadruple Gun Mount Kai
RM 381 mm381mm/50 Triple Gun Mount
381mm/50 Triple Gun Mount Kai
IJN 41 cm USN 16 in Twin USN 16 in Triple RN 16 in IJN 46 cm 51 cm TwinPrototype 51cm Twin Gun Mount
51cm Twin Gun Mount
51 cm TriplePrototype 51cm Triple Gun Mount
basic41cm Twin Gun Mount
Prototype 41cm Triple Gun Mount
41cm Triple Gun Mount Kai
Triple K241cm Triple Gun Mount Kai Ni Twin K241cm Twin Gun Mount Kai Ni Mk.I16inch Mk.I Twin Gun Mount Mk.V16inch Mk.V Twin Gun Mount Mk.VIII16inch Mk.VIII Twin Gun Mount Kai Mk.716inch Triple Gun Mount Mk.7 Mk.7
+GFCS
16inch Triple Gun Mount Mk.7 + GFCS
Mk.6
mod.2
16inch Triple Gun Mount Mk.6 mod.2
Mk.I16inch Mk.I Triple Gun Mount +AFCT16inch Mk.I Triple Gun Mount + AFCT Kai Kai
+FCR
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
ProtoPrototype 46cm Twin Gun Mount 46cm46cm Triple Gun Mount Kai46cm Triple Gun Mount Kai
Gangut-class +7
Sov 30.5 cm: +10
0 +1 -7 -5 -3 -9~10? ?? ?? -7 -18 ?? N/A
Kongou-class +7 0 -2 -5 -5? -5 -6~7? -5 -6 -3 -7 -10 -10?
Bismarck-class
Vittorio Veneto-class
+4 0? +1 -5 -5 -4? -5 ?? ?? -7 -10 ??
Iowa-class +4? 0? -2? -5 0 +2 -7 -10 ??
Colorado-class +1 +2 -2 -7
South Dakota-class -5
M: +4.6
Richelieu-class +4 +4~5 -2 -5 -5 -7 -14? -8 -7 -10 ??
Queen Elizabeth-class +6
RN 38.1 cm: +8
+1~2 +2 -2? +5 ?? +3~4 -8 -11 ??
Nelson-class 0 0 +3? 0 0
Fusou-class Kai/Ni
Ise-class Kai
+4 0 +2 +2 0 0? -3 -7
F+: -11?
-4?
Ise-class Kai Ni +4? 0 +4? +4? +6 +2 ?? -7
F+: -11?
??
Fusou-class base
Ise-class base
+2 0 +2 +2 +2 +2? +3 -3 -7 ??
Nagato-class base/Kai 0 ??
Nagato-class Kai Ni +2? 0 +2? +5 +5 +5~6 Mutsu: +3 0 +4 -2? -4? -6? Nagato: -5
Mutsu: -8
??
Yamato-class 0 +3 +3 +7 0 ??
Yamato Kai NiYamato Kai Ni[2] (FBB) 0 ?? -7 ?? ?? -10

Note: Fit gun mechanics are still being investigated to this day, hence the values are not final and may be subject to changes. Values with a question mark either mean that it is not conclusive yet or the conclusion drawn here is not the same as the one drawn by Yumeji.

  • The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
  • For married ships, the overweight penalty is reduced by 40% (A married Kongou with a 46cm receives a penalty of -6 instead of -10, for example).
  • If more than one gun of the same class is used, multiply the modifier by the square root of number of guns. (A Kongou-class with two A class guns equipped for example, that's √2 x 7 = 9.89)
  • If guns from different classes are used together, add the modifiers together. (A Kongou with a 35.6cm and 41cm mixed for example, that's 7 - 5 = 2.
  • Exceptions arise where different guns of the same class give different bonuses on certain ships, notably Gangut. What would happen if you combine 30.5cm and 35.6cm is still under investigation.
  • The information in this table is sourced from this spreadsheet maintained by Dewy with the relevant sources linked in the spreadsheet.

More generally, the accuracy offset can be defined with the formula:

[math]\displaystyle{ W = \sum^{\text{All Classes}} \left ( C_{k} M_{k} \sqrt{N_{k}} \right ) \% }[/math]

Where:

  • [math]\displaystyle{ W }[/math] is the resulting fit bonus or overweight penalty
  • [math]\displaystyle{ C_{k} }[/math] is the main coefficient of the equipped gun class. Refer to the above table for the coefficients applied to each Battleship for their respective guns.
  • [math]\displaystyle{ M_{k} }[/math] is the marriage coefficient for the particular gun class. Assumes a value of 0.6 if the ship is married, and if the main coefficient is negative.
  • [math]\displaystyle{ N_{k} }[/math] is the number of equipped guns for that gun class.

Cruiser Gun Fit

Medium Caliber Main Gun High-Angle Gun Medium Guns
Gun Groups Guns
A 14 cm Single14cm Single Gun Mount · 14 cm Twin14cm Twin Gun Mount · 14 cm Twin Kai14cm Twin Gun Mount Kai
B 15.2 cm Twin15.2cm Twin Gun Mount · 15.2 cm Twin Kai15.2cm Twin Gun Mount Kai · 15.2 cm Twin Kai Ni15.2cm Twin Gun Mount Kai Ni

Bofors 15.2 cm Twin Mod 1930Bofors 15.2cm Twin Gun Mount Model 1930 · Bofors 15 cm Twin Mk9 Mod 1938Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Model 1938 · Bofors 15 cm Twin Mk9 Kai + Single Mk10 Kai Mod 1938Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Kai + Single Rapid Fire Gun Mount Mk.10 Kai Model 1938

6" Twin MkXXI6inch Twin Rapid Fire Gun Mount Mk.XXI

C 15.5 cm Triple15.5cm Triple Gun Mount · 15.5 cm Triple Kai15.5cm Triple Gun Mount Kai
D 6" Triple Mk166inch Triple Rapid Fire Gun Mount Mk.16 · 6" Triple Mk16 mod26inch Triple Rapid Fire Gun Mount Mk.16 mod.2

6" Triple MkXXIII6inch Mk.XXIII Triple Gun Mount

152 mm/55 Triple152mm/55 Triple Rapid Fire Gun Mount · 152 mm/55 Triple Kai152mm/55 Triple Rapid Fire Gun Mount Kai

E 5" Twin CD5inch Twin Dual-purpose Gun Mount (Concentrated Deployment) · GFCS + 5" Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
F 20.3 cm Twin20.3cm Twin Gun Mount · 20.3 cm N°2 Twin20.3cm (No.2) Twin Gun Mount · 20.3 cm N°3 Twin20.3cm (No.3) Twin Gun Mount

SKC34 20.3 cm TwinSKC34 20.3cm Twin Gun Mount · 203 mm/53 Twin203mm/53 Twin Gun Mount

G 8" Triple Mk98inch Triple Gun Mount Mk.9 · 8" Triple Mk9 mod28inch Triple Gun Mount Mk.9 mod.2


Light Cruisers (CL/CLT)[1]

Ship Guns group[2] Accuracy bonus/penalty
1st Gun 2nd Gun Unmarried Married
Default to
very CL(T)
- - 0 0
A/B A/B 0 2
C C -5 -1
D D -6 -3.6
E E
F F
F - -3 -1.8
G G -22 -17.6
Agano-class B - 5 7
B B 6 8
F F -8 -6
Ooyodo C C -2 -1.2
F F -10 -8
Atlanta-class E E 0 3
Abyssals Any Any 0 -
Medium Guns -3 x N -
  • There is not enough data to pin down the exact fit accuracy formula.
  • Other gun combinations fits cannot be extrapolated yet.
  • There are known tests where the fit bonuses do not scale linearly with the number of guns.

Heavy Cruisers (CA/CAV)

Ship Class 14cm Twin14cm Twin Gun Mount
14cm Twin Kai14cm Twin Gun Mount Kai
B C 20.3cm20.3cm Twin Gun Mount
20.3cm(2)20.3cm (No.2) Twin Gun Mount
20.3cm(3)20.3cm (No.3) Twin Gun Mount
203mm/53203mm/53 Twin Gun Mount G
Day Night
CA(V) 0 +5 +5N?Accuracy 0
Mogami-classMogami
Mikuma
Suzuya
Kumano
+2Accuracy
Mogami-class Kai NiMogami Kai Ni
Suzuya Kai Ni
Kumano Kai Ni
+5Accuracy
Zara-classZara
Pola
+1Accuracy +1Firepower
Seaplane Tenders (AV) -6NAccuracy -6NAccuracy -8 -10NAccuracy -8 -10N?Accuracy

Note: Fit gun mechanics are still being investigated to this day, hence the values are not final and may be subject to changes. Values with a question mark mean that it is potentially outdated and might no longer be correct.

  • The table shows an estimated accuracy and/or firepower fit bonus based on having one fit gun equipped.
    • The variable N refers to the number of guns of that category equipped. (Ex: 2 guns of 2N = 4 ACC)
  • Bonuses from guns of different classes are simply added together.
  • The night fit bonus from the 20.3cm series used to be capped at +15%. However, it is unknown whether this cap has been removed or not from the recent updates.
  • There is a possibility that certain fit categories only work during the day. The possibility is plausible, but there's no concrete data proving. The alternative theory is that the night bonus from the 20.3cm series overrides any other categories.
  • The information in this table is sourced from these two spreadsheets (1) (2) the latter maintained by Dewy, both with the relevant sources linked in the spreadsheet.
  • As of 13th December 2018 the hidden firepower bonus of 14cm Twin Gun Mount Kai14cm Twin Gun Mount Kai does not work/does not exist[citation needed].